peter koontz



" (No Model.)

. `J.P.Koo1\17.z.

NUT LOCK.

No. 474,837. Patented May 17, 1892.

@d IR Koo n il?? me THE NGRRIS PETRS C0 FNOTD LITHD WASHINGTUN D CUNITED STATES j PATENT OFFICE.

JOHN PETER KOON TZ, OF NEWARK, OHIO, ASSIGNOR OF ONE-HALF TO EZRA H.SMITH AND ROBERT M. DAVIDSON, OF SAME PLACE.

NuT4LocK.

sPEcInicATIoN forming part of Letters Patent No. 474,837, dated May17,1892.

Application filed December 26, 1891. Serial No. 416,241. (No model.)

To all whom it may concern:

Be it known that I, JOHN PETER KooNrz, a citizen of the United States,residing at Newark, in the county of Licking and State of Ohio, haveinvented a new and useful Nut- Lock, of which the following is aspecification.

. This invention relates to that class of nut'- locks employing asheet-metal disk having a bolt-opening and adapted to be introduced overthe threaded end of the bolt and to be screwed down against the crown ofthe nut somewhat after the manner of a jam-nut, for which purpose theinner edge of the boltreceiving opening has heretofore either beenthreaded by cutting or by the formation given to said edge or to thelock.

The objects of my invention are to provide a lock of this class whichshall be of simple construction, may be simply stamped from sheet metal,and which when in position upon the bolt will be non-retrograding,except by the application of a tool for starting the same, for thereception of which tool the said lock is adapted.

Vith these objects in view the invention consists in certain features ofconstruction hereinafter specified, and particularly pointed out in theclaims.

Referring to the drawings, Figure l is a perspective of a bolt, the nutof which is locked in accordance with my invention. Fig. 2 is a sideelevation of the bolt in section and the nut and washer, the latter twobeing in section. Fig. 3 is a detail in plan of the lock. Fig. 4 is atransverse or radial section of the Same.

metal, the plate being stamped therefrom. 5 designates the said lockingplate or disk, the external contour of which is polygonal (in thisinstance octagonal, as shown) and is adapted to be grasped between thejaws of an ordinary nut-wrench and to be applied to the bolt in asimilar manner.

The locking plate or disk is provided with a central bolt-receivingopening 6, the opposite edges of which are uniformly beveled or roundedto conform to the space between the threads ofthe bolt. One edge of theopening 6 is provided with a key-hole slot or perforation 7, the sameconstituting a pair of angular shoulders 8 and 9 at its intersectionwith the opening 6. After the nut is in position upon the bolt thelocking plate or disk is run down upon the threads of the bolt, one ofthe corners (in this instance the corner 9) being induced to enter andengage the thread of the bolt, as will be obvious. The movement of thelocking-disk continues along the bolt until it arrives at the cut orgroove 4, which causes a forcing together of the two shoulders S and 9,so that they realign with each other and form a continuous circle oredge, which, as will be seen, will take within the annular groovehereinbefore described as being formed by the combined thread, or ratherspace, between the same and the groove 4, so that the said lockingplatewill be free to turn in either direction, but by reason of its aligningshoulders, cannot again be induced to take up the thread of the bolt andeither advance or retrograde therefrom. It will be seen that the nutwill have absolutely no play upon the bolt in either direction, but willbind firmly against the plate and remain so until the bolt is removed.

In order to remove the lock, it is simply necessary to introduce apointed tool into the keyhole-slot formed in the edge of the opening 6.Then using the same as a prying-lever, the shoulder 8 may be raised outof the plane of the shoulder 9 andthe plate or lock being turned to theleft the thread of the bolt will be taken upby said shoulder `andfollowed, and thus the plate or lock removed without any injury whateverto the thread of the bolt.

In practicing my invention I contemplate using any kind of sheet metal,whether hard or soft, malleable or spring.

Having described my invention, what I claim is- 1. The combination, withthe bolt and the nut, the said bolt being provided With a screwthreadand grooved annularly immediately in rear of the nut, of the sheet-metallockingplate having a bolt-receiving openi ng adapted to be threaded onthe bolt, substantially as specified.

2. The combination, with the bolt and the nut,thesaidboltbeing providedwith athread grooved ann nlarly immediately in rear of the nut, saidgroove combining with the adjacent space between the threads to form anannular groove encircling the bolt, of .the sheetmetal locking-platehaving an opening for the reception of the bolt and having one edge ofitsopening provided with a radiating slot, substantially as specified.

3. The combination, With the bolt and the nut, the said bolt beingprovided with a thread grooved annularly immediately in rear of the nut,said groove combining with the adjacent space between the thread to forman annular groove encircling the bolt, of the sheet-metal locking-platehaving an opening for the reception of the bolt and having one edge ofits opening provided with a radiating keyholeslot, substantially asspecified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of tWo Witnesses.

f JOI-IN PETER KOONTZ.

Witnesses:

AMOS BERHOPE, GEO. W. HoR'roN.

